LTC6803-1 and -3 - Multicell Battery Stack Monitor

Analog Devices

LTC6803-1 and -3 - Multicell Battery Stack Monitor RSS Sample
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Linear Technology
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The LTC6803 is a 2nd generation, complete battery monitoring IC that includes a 12-bit ADC, a precision voltage reference, a high voltage input multiplexer and a serial interface. Each LTC6803 can measure up to 12 series-connected battery cells or supercapacitors. Using a unique level shifting serial interface, multiple LTC6803-1/ LTC6803-3 devices can be connected in series, without opto-couplers or isolators, allowing for monitoring of every cell in a long string of series-connected batteries. Each cell input has an associated MOSFET switch for discharging overcharged cells. The LTC6803-1 connects the bottom of the stack to V– internally. It is pin compatible with the LTC6802‑1, providing a drop-in upgrade. The LTC6803-3 separates the bottom of the stack from V–, improving cell 1 measurement accuracy.

The LTC6803 provides a standby mode to reduce supply current to 12μA. Furthermore, the LTC6803 can be powered from an isolated supply, providing a technique to reduce battery stack current draw to zero.

For applications requiring individually addressable serial communications, see the LTC6803-2/LTC6803-4.

SPI Interface Isolated V- LTC6802 Pin Compatible LTC6803-1 Daisy Chain No Yes LTC6803-2 Addressable No Yes LTC6803-3 Daisy Chain Yes No LTC6803-4 Addressable Yes No

* Measures Up to 12 Battery Cells in Series * Stackable Architecture * Supports Multiple Battery Chemistries and Supercapacitors * Serial Interface Daisy Chains to Adjacent Devices * 0.25% Maximum Total Measurement Error * Engineered for ISO26262 Compliant Systems * 13ms to Measure All Cells in a System * Passive Cell Balancing:

– Integrated Cell Balancing MOSFETs

– Ability to Drive External Balancing MOSFETs * Onboard Temperature Sensor and Thermistor Inputs * 1MHz Serial Interface with Packet Error Checking * Safe with Random Connection of Cells * Built-In Self Tests * Delta-Sigma Converter With Built-In Noise Filter * Open-Wire Connection Fault Detection * 12μA Standby Mode Supply Current * High EMI Immunity * 44-Lead SSOP Package

Designed for Automotive and Transportation Applications AEC-Q100 generic family data available for specific packages

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